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TS 23.527 CT4 ★
5G System — Restoration Procedures

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V16.2.0 (Wzip) 2019/12 19 p.

V15.3.0 (PDF) 2019/06 22 p.

Rapporteur: Mr. Wild, Peter A.

The present document defines the restoration procedures in the 5G System, related to:

the N4 Interface,
the User Plane Interfaces N3 and N9,
Service-Based Interfaces,
Public Warning System (PWS).

full Table of Contents for TS 23.527 Word version: 16.2.0

1 Scope Word-p. 5

3 Definitions and abbreviations

3.1 Definitions

3.2 Abbreviations

4 Restoration Procedures related to the N4 Interface Word-p. 6

4.2 N4 Failure and Restart Detection

4.3 UPF Restoration Procedures

4.3.2 Restoration Procedure for PSA UPF Restart

4.3.3 Restoration Procedure for PSA UPF Failure without Restart

4.3.4 Restoration Procedure for Intermediate UPF Restart

4.3.5 Restoration Procedure for Intermediate UPF Failure without Restart Word-p. 7

4.4 SMF Restoration Procedures

4.4.2 Restoration Procedure for SMF Restart

4.4.3 Restoration Procedure for SMF Failure without Restart Word-p. 8

4.5 N4 path failure

5 Restoration Procedures related to the User Plane Interfaces N3 and N9

5.2 User Plane Failure Detection

5.2.1 Loss of GTP-U contexts

5.2.2 User Plane Path Failure

5.3 Restoration Procedures upon Loss of GTP-U contexts

5.3.2 Procedure for GTP-U Error Indication received from 5G-AN Word-p. 9

5.3.2.1 Principles

5.3.3 Procedure for GTP-U Error Indication received from UPF Word-p. 10

5.3.3.1 GTP-U Error Indication received by 5G-AN

5.3.3.2 GTP-U Error Indication received by another UPF

5.4 Restoration Procedures upon User Plane Path Failure

6 Restoration Procedures related to Service-Based Interfaces Word-p. 11

6.2 NF (NF Service) Failure and Restart Detection using the NRF

6.2.2 NF (NF Service) Failure

6.2.3 NF (NF Service) Restart Word-p. 12

6.3 NF Service Producer Restart Detection using direct signalling between NFs Word-p. 14

6.3.2 NF Service Producer Restart

6.4 NF Service Consumer Restart Detection using direct signalling between NFs Word-p. 15

6.4.2 NF Service Consumer Restart Word-p. 16

6.5 NF Service Instance Reselection Word-p. 17

7 Restoration Procedures related to Public Warning System (PWS)

7.2 PWS operation failure in NG-RAN

7.3 PWS operation restart in NG-RAN

A Change history Word-p. 19